Abstract: An apparatus for supporting a user comprising a platform extending between first and second edges each having two corners, a frame having four substantially parallel uprights located proximate to each of the first and second edges of the platform, each of said uprights slidably locating said platform proximate to a corner of said platform and an elastic support member extending between each of the first and second edges of the platform and the frame so as suspend the platform from the frame. The platform is biased from a first position located proximate to a ground surface to a second position vertically spaced above the first position by the elastic support members, wherein said first and second positions are substantially parallel to each other.